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I recently bought a Color Classic off ebay, mostly because I just always wanted one.

I finally pluged it in and started looking around and notices something very annoying. The image on the screen either slightly contacts and expands, or jumps up and down slightly every now and again. I haven't put enough study into it to state it as fact, but it seems to happen during disk activity.

Any idea on what might be causing this? The screen is bright and looks great, but I'm worried that it may be a symptom of a real problem, like the analog board is on it's last legs.